Renntech Stage 1 M157 tune in a 2012 CLS63 AMG runs 11.3@125

Low 11's with just a tune in warm 85 degree Florida weather? That is what a CLS63 AMG (non-Performance Package) with the Stage 1 Renntech M157 tune just did. The Stage I tune raises boost from the stock 14.5 psi to about the exact same amount as the performance package, 18.8 psi. The vehicle was completely stock except for Nitto NT05 drag radials. Density altitude was just under 2000 feet which means in winter conditions we can realistically expect high 10's out of tune only M157 cars.

This vehicle belonged to a customer so hard launches / launch control were not used as the 1.8 60 foot validates. This just the beginning of M157 performance tuning and things are off to quite a great beginning.

I mentioned in the OP timing as that was the logical correlation and was told that was not the case. I am simply relaying what I was told.

I just read the post you're referring to.

Okay, so here's where I'm coming from. Adjusting limiters doesn't make power, it allows the car to advance the timing and make the boost that is commanded for the programmed settings. Re-scaling the mapping, however, can adjust where the power is made on the power curves.

But, when I'm making the comparisons that I'm making here, I'm referring to cars that are running under optimal conditions, hence the discussion of heavy sedans running high 10's.

So, the PP E63 that I'm discussing is firing on all cylinders, so to speak. The stock limiters may not be as aggressive as the RT stage 1 settings, but I still maintain that the PP's power will be sufficient to propell the it, as the lighter car, down the track quicker/faster than the RT stage 1 CLS 63.

The PP E63's tune also can likely adapt up if it recognizes higher octane. Granted, the power that it can ultimately make will be 20 hp/40 tq less than the RT stage 1 car, but stock limiters on the PP car won't be a hinderance for that car given optimal conditions, so the more aggressive limiters in the RT car will merely allow it to make the 20 hp/ 40 tq extra power, which still shouldn't be enough to compensate for the extra weight.

Nice times! Road & Track tested a 2012 CLS63 w/Performance package & did 12.0@122.5 on less humidity & colder weather. So now the RT tune alone it's doing almost 0.7 seconds faster in less than favorable conditions, this must be a much faster car in better weather. http://www.roadandtrack.com/tests/up...benz-cls63-amg

Nice times! Road & Track tested a 2012 CLS63 w/Performance package & did 12.0@122.5 on less humidity & colder weather. So now the RT tune alone it's doing almost 0.7 seconds faster in less than favorable conditions, this must be a much faster car in better weather. http://www.roadandtrack.com/tests/up...benz-cls63-amg

I don't see any mention in the Road and Track article about the use of DR's so there is a difference in testing methods, and therefore, there wouldn't be a gap of .7 seconds if DR's were used in both tests.

I don't see any mention in the Road and Track article about the use of DR's so there is a difference in testing methods, and therefore, there wouldn't be a gap of .7 seconds if DR's were used in both tests.

That's definetly a good question Sonny! But, who is driving an almost 4300lbs 2wd sedan 10's sec car on street tires really?

That's definetly a good question Sonny! But, who is driving an almost 4300lbs 2wd sedan 10's sec car on street tires really?

I guess Road and Track did.

But, I've always wished that auto mags would test these cars with DR's. I agree with you, it's dumb to test the 1/4 mile times with street tires and not DR's.

Although, I understand that often, the testing is not done on a prepped track; the testing is often done in areas that also have space for skidpad testing, which would necessitate the use of the stock rear tires.

I don't see any mention in the Road and Track article about the use of DR's so there is a difference in testing methods, and therefore, there wouldn't be a gap of .7 seconds if DR's were used in both tests.

Trap would still differ and often street tires produce higher traps due to spin...

Although, I understand that often, the testing is not done on a prepped track; the testing is often done in areas that also have space for skidpad testing, which would necessitate the use of the stock rear tires.

Not really true, Insideline uses the Fontana strip when prepped for example. The local SoCal mags do the same thing often, including Road and Track.

Trap would still differ and often street tires produce higher traps due to spin...

Of course trap would still differ if there was a power difference but I was responding to a post that mentioned ET--thus my mention of the effect DR's would have on ET.

And although spin can help increase trap, it's not a bright line rule, as even in my own very limited drag racing experience, I have seen quicker 60' equate to higher traps than runs with slower 60' due to spin.

As I said, I was speaking about ET, because @m54b25 mentioned ET. I don't really understand the relevance of responding with "trap would still differ" other than you just want this to be a pure "Renntech rules" thread. Otherwise, you wouldn't have felt the need to "correct" my conception of comparing two cars that were run in the 1/4 mile; one with DR's one one without.

Of course trap would still differ if there was a power difference but I was responding to a post that mentioned ET--thus my mention of the effect DR's would have on ET.

And although spin can help increase trap, it's not a bright line rule, as even in my own very limited drag racing experience, I have seen quicker 60' equate to higher traps than runs with slower 60' due to spin.

And I get that you didn't state a brightline rule, you said "often."

I have consistently seen higher traps with better 60's in my own drag racing experience with my E92 which I might as well call limited as well. With drag radials... street tires spinning produced higher traps on my E46's.

My point is that street tires are often capable of higher traps due to poor 60 foots inflating them and that a higher trap with a better 60 means it is a far more sound representation. Obviously drag radials are used far more for ET than trap as the goal is the 60 foot.